Path: utzoo!attcan!uunet!stretch.cs.mun.ca!leif!jgarland
From: jgarland@kean.ucs.mun.ca
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Experience with bargain 80287
Message-ID: <109498@kean.ucs.mun.ca>
Date: 31 Jul 90 11:39:37 GMT
References: <12085@sdcc6.ucsd.edu> <1238400005@uxa.cso.uiuc.edu>
Organization: Memorial University. St.John's Nfld, Canada
Lines: 35

In article <1238400005@uxa.cso.uiuc.edu>, dlg6627@uxa.cso.uiuc.edu writes:
>>About a month ago someone posted information about bargain priced
>>80287.  If I recall correctly, they were available for $100 each
>>from a company in Chicago (?)
> 
> Look at PC Week. It is advertised in this magazine.
> 
> 
>>Has anyone had experience using one of these chips in a 12 MHz AT?
>>If so, can you you tell us if you had any problems, and repost the
>>address/phone number of the supplier?
> 
> 

I got one here in Canada.  As I reside in a rather remote location, I 
asked them to send it by mail.  It arrived within 12 days (and 
Customs didn't even sock me for our 12% Federal Sales Tax, nor any 
duties if any are still around these days).  It works fine on my Dell 
200 12.5 Mz machine (AT clone).  This machine can be set to run the 
coprocessor at 2/3 CPU speed *or* at CPU speed.  AMD says that there 
aren't any heat risks (due to the fact it is a CMOS chip) from 
running the chip fast, but that there is a risk of errors at speeds 
greater than 10.75 Mz as that is the cutoff point for flunking their 
test suite.  Experimenting on FRACTINT v.13 and Quattro,I have found 
no errors but also that the difference between running the 287 at 8.3 
vs. 12.5 Mz is only about 10%.  As such, I've decided to go with the 
slower speed as the big difference is just plain *having* the 
coprocessor in the machine in the first place.

You are reading one satisfied customer's reply.

John Garland

Bitnet:  jgarland@mun
Internet: jgarland@kean.ucs.mun.ca